Panasonic Nn-sv30 Manual [exclusive] -

Regular maintenance prevents food particles from baking onto the interior walls, which can cause arcing or smoke. Interior Cleaning

This appliance must be grounded. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current. Panasonic Nn-sv30 Manual

Do you need (like the glass tray size)?